Roll-paper retainer



Nov. 5, 1929. w. D. WHITE ROLL PAPER RETAINER Filed Nov. 7, 1928 .j 7 1110 III!!! IIIIII/i whlch intermittently Patented Nov. 5, 1929 UNITED STATES PATENT OFFICE WALLACE D. WHITE, OF NASHUA, NEW HAMPSHIRE, ASSIGNOR- TO NATIONAL BREAD WRAPPING MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS ROLL-PAPER RETAINER Application filed November 7, 1928. Serial No. 317,849.

This invention relates to machines for cutting webs of paper into sections, and has particular reference to that type of machine draws a web from a supply roll and pushes it to position Where a knife cuts it transversely.

In machines of the type shown in Letters Patent No. 1,253,636 granted January 15, 1918, to Sevigne & Arnold, paper to form bread wrapper sections is intermittently fed -bination of from a supply roll, over a bed, to position to be cut. In such machines a presser foot bears intermittently on the paper and holds it stationary on the bed while the knife is raised, so that when the next feed of the paper occurs an exact predetermined length will be cut oil". It has been found that such resser sometimes causes the paperto stic to the bed, resulting in some interference with starting the paper along for the next step of the feed. To overcome the objection just mentioned, the paper detent or retainer illustrated in Letters Patent No. 1,597,547, granted August 24, 1926, to Sevigne & Chabot was provided. It has been found however, that the pivoted cam-shaped detent or retainer of the lastmentioned patent is liable to affect the wax coating and printing borne by the paper, owing to the wiping action when the paper is drawn under it; also that said detent wears flat in use, and that it is liable to have its effectiveness reduced by becoming more or less coated with the wax of the wrapping paper.

The object of the present invention is to provide improved means located to automatically act on the paper before it reaches the feeding means, to prevent retrograde'movement of the paper, and to effect this result without having any wiping action on the paper, thereby avoiding all of the above noted objections.

With the described object in view, the invention consists in the construction and comparts substantially as hereinafter described and claimed.

Of the accompanying drawings which illustrate so much of a paper feeding and cutting machine of the type above referred to as is necessary to an understanding of the present invention igure 1 is a sectional side elevation of the essential parts of the machine.

Figures 2 and 3 are larger-scale elevations, looking in opposite directions, of the grippingroll and its supporting member.

Figure 4 is a View looking in the direction of the arrow 4 (Fig. 2) and indicating by dotted lines a roll may temporarily occupy when a we paper is being threaded to position in the machine.

Similar reference characters designate similar part-s in all of the views;

A portion of the frame of the machine is illustrated at 40, said frame supporting the drum 83. Said drum and a roll orrolls 87 carried by a shaft 89 intermittently push or feed the web of paper over a bed 88 which is transversely slotted for the passage of a knife 129 which is raised and lowered by any suitable means such as suitable connections with arms 132 of a rock shaft 133.

Assuming that the intermittent feeding of the web is effected by intermittently raising the roll or rolls 87 so there will be no cooperation with the drum 83, as explained in the Patent No. 1,253,636 referred to, the paper would then be liable to be then pulled back by the tension devices such as the gravity rolls 84, 85, mounted in the inclined ways 86.

The numerals employed herein are the same as those which designate parts having similar numerals in the Patent 1,253,636-to which reference may be had if further explanation of the said parts and their operation is desired. Letters of reference are employed to designate the parts which cooperate with those having numerals, in attaining the object of the present invention.

To prevent backward movement of the paper web, said web is held or gripped against backward movement while on its way to the feeding members 83, 87. The web of paper from a roll supported by a core 82, after passing under the gravity rolls 84, 85, passes over the drum 83 and under the roll or rolls 87 position which the gripping carried by the shaft 89, and the present gripping action is effected on the middle-width portion of the web on the drum 83..

. Supported by the frame 40 is a cross bar a to which the upper portion 1) of a depending bracket is secured, as by screws. The lower portion of the bracket .has a flat face providing a plate a which is offset from the upper portion, leaving an intermediate shoulder (1. Projecting rearwardly from the lower ortion is a horizontal round stud e.

A loosely mounted yoke comprises a cross bar f, preferably round in cross section, having arms 9 in which is mounted the axle or shaft pin it of a roll 2', the latter of friction material such as rubber. Normally the yoke and its roll hang loosely from the stud e, with the roll resting against the plate a, as illustrated by Figure 1.

As explained in the Patent No. 1,253,636, the roll 87 4 and drum 83 are constantly driven in the direction of the arrows, Figure 1, and when the roll-87 is lowered and. feeding is effected, one or both of the gravity rolls 84. 85, is lifted, and then, when the gravity rolls slide back down, they draw paper from the roll on the core 82, the friction roll z' preventing the paper from being drawn back by the action of the gravity rolls. Said roll 11 permits the web to be readily drawn along for feeding a correct distance, but when the up-' per roll or rolls 87 rise from the drum 83, the roll 11 automatically grips the paper thereby ensuring accuracy of the lengths of paper to be cut off by the knife 129. This gripping action is due to the converging relationship between the flat plate 0 of the bracket and the surface of the drum 83, and the fact that the roll 11 is so loosely supported that whenever feeding ceases and the gravity rolls 84, 85, tend to pull the web back, the roll '5 instantly resists any backward movement of the web because of the friction of its rear surface against the flat face or plate 0 of the fixed bracket. In other words, the roll becomes temporarily wedged between the plate 0 and the web backed by the surface of the drum 83. When feeding is being effected, the movement of the web tends to rotate the roll 01 in the direction of the arrow (Fig. 4) and to somewhat raise the roll so that its presence does not interfere with the feeding.

Among the advantages of the present detent or retainer over such structure as in the Patent No. 1,597,547 are the following :-The roll 11 causes no drag on the paper web when it is being fed, and it will not become fiattened in use, and by its occasional rotation it is constantly presentinga fresh surface to bear on the plate 0 and on the paper. The fact that said roll 11 is free to rise and fall and to also rock or tilt endwise (due to the rocking bearing of the cross bar f on the stud 6) enables the roll to act on the paper throughout the length of the roll in conformity with any unevenness in the surfaces contacting therewith.

The provision of the shoulder d enables the detent or retainer to be displaced when desired. For instance, when a web of paper is to be introduced into and threaded through the machine; the roll and yoke are simply pushed up tothe position indicated by dotted lines in Figure 4, Where they will remain during such installation of the web, and then a slight touch of a finger will dislodge the yoke and roll from such displaced position and they will fall back and automatically resume the operative position of Figure 1.

The Patent No. 1,253 636 hereinbefore referred to is for a bread wrapping machine, but I do not limit myself, so far as the pres; ent invention is concerned, to any particular machine which feeds and cuts a paper web, and for this reason I deem it unnecessary to illustrate non-essential parts of any complete machine.

Having now claim: x

1. In a machine having means for intermittently feeding a web of paper and cutting it into sections to form wrappers, a rotating support for the web, a fixed plate tangential to said support, and a roll movably supported between said support and plate.

2. In a machine of the character described, a support for a web of paper to be fed, a plate adjacent thereto, and a friction roll yieldingly mounted between said support and plate.

. 3. In a machine having means for intermittently feeding a web of paper and cutting it into sections to form wrappers, a rotating support for the web, a-fixed plate tangential to said support, and a friction roll between said support and plate. said roll being mounted to be capable of tilting endwise and to move toward and from the narrower portion of the space between said support and plate.

- 4. In a machine of the character described, a support for a web of paper to be fed, a fixed plate adjacent to and spaced from said support, and a friction roll between said support and plate, said roll being mounted to be capable of tilting endwise and to be shifted over said plate.

5. In a machine of the character described, a support for a web of paper to be fed, a plate adjacent thereto, and a friction roll yieldingly mounted between said support and plate, means being provided for supporting the roll in temporarily displaced position.

6. In a machine of the character described, a support for a web of paper 'to be fed, a fixed bracket having a flat portion providing a plate adjacent to and spaced from said support, said bracket having a rearwardly projecting stud, a bar supported by said stud described my invention, I

web of paper,

and having arms, and a roll supported by said arms and bearing against said plate.

7. A paper-retaining attachment for a machine which has a rotating suppcrt for a said attachment comprising a bracket having a portion which provides a flat face or plate and having a stud behind said face or plate, and a yoke hung upon said studand carrying a roll extending across said flat face.

In testimony whereof I have aflixed my signature.

WALLACE D. WHITE. 

